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... Chemical weathering breaks down rocks by changing their composition. Oxidation and the action of acids are important chemical weathering processes. Oxidation – rocks exposed to air can react with the oxygen Many rocks contain iron which will rust when exposed to oxygen making the rock weaker Acids – ...
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... • Covered a large part of the planet only 1015,000 years ago • Large body of ice moving down a slope or spreading outward on a land surface • Can move as much as 1 meter per day • Northern New Jersey Covered by Glaciers ...
Changing Earth
Changing Earth

... dirt to roll slowly or quickly downhill. Heavy rain can loosen a steep hill’s materials. Gravity pulls down the materials. They land in piles at the bottom. The rapid downhill movement of a large amount of rock and soil is a landslide. Freezing and thawing can loosen rock. Sometimes rock gets loosen ...
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Rocks and Soil Outline: • Introduction • Rock Weathering o

... Rivers draining mountain regions often carry huge sediment loads due to high rates of mechanical weathering and erosion at elevation ...
Michela Griffin
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... Sedimentary rock is formed from the long-term deposit and compaction of sediments into rock. Metamorphic rock is rock formed when another type of rock is changed by pressure, heat, and tectonic processes. (i.e. limestone  marble) ...
World Geography 3202
World Geography 3202

... Folding, compression, anticline, syncline etc. Fault mountains: normal, reverse, block, rift valley, overthrust faults etc.. Volcanoes: how formed and different type and their characteristics. Denudation; the breaking down and wearing away of the land…weathering & erosion. Physical Weathering (frost ...
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File

... 6. Which of these produces gas bubbles when it touches acid? a. shale b. all conglomerates c. humus d. limestone 7. What does the term permeability refer to? a. the hardness of soil b. the slope of soil c. the flow of water through soil d. the quality of the soil for use in farming 8. Which of the f ...
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Desert Area of land with too little rainfall to support much

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31.3 Sedimentary Rocks Blanket Most of the Earth`s Surface

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No Slide Title

... • A mineral is a naturally occurring, inorganic, solid element or compound having a definite chemical composition and a specific internal crystal structure • A rock is a solid, cohesive, aggregate of one or more minerals. Each rock has a characteristic mixture of minerals, grain sizes, and ways in w ...
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... Here are the instructions for using QQT (Quiz, Quiz, Trade) cards (apologies to those who already know about these). The game is so simple but the children seem to love it. 1. Give out the cut-up QQT cards (ideally laminated) – you need one per child and a few spares if the teacher and any other adu ...
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... Lava flows out of Earth’s surface when a volcano erupts. To protect beaches from erosion, people can plant grasses. Faults are cracks that form in Earth’s crust. An example of a constructive process would be a volcano forming islands in the Pacific Ocean. Water is a significant factor in the physica ...
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Petrology Instructor Fundamentals Magmatic Rock Bodies Study of

... • Determine the minerals present • Estimate their abundance • Calculate the rock composition using proper weightings ...
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... 2. Chemical – Any process that causes rock to break down by __________________________________ and results in a __________________ in the mineral/chemical _____________________________. (1) Chemical Weathering: _____________________________________________________ ...
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... 22. Equinoxes occur when the sun is directly over the equator. The Spring equinox is March 21st and the Autumnal (Fall) equinox is September 22nd. An equinox has 12 hours of daylight and 12 hours of night. ...
soils: chemical transformations during weathering and soil formation
soils: chemical transformations during weathering and soil formation

... the earth’s surface. Weathering processes may be classified into two main types, namely physical (or mechanical) and chemical weathering. During physical weathering, rocks break in response to stresses that have been established within the rock. The breaking may occur along fracture planes in the ro ...
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... • Controls bioavailability of elements that have no gaseous form • Impacts soil fertility, biological diversity, agricultural productivity ...
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Intrusive Landforms

... • Large masses of intrusive rock. • Cause a general doming up of the surface as they are forming. • Only exposed after general weathering and erosion of less resistant overlying ‘country rock’. • Weathering is facilitated, (helped), by the fractures and cracks that develop due to the tensional force ...
Geologic History
Geologic History

... Structure of Earth Crust (3 g/cm3) - made of continental (granites) and oceanic (basalts) Mantle (3 - 5 g/cm3) - 2900 km thick layer; location of lithosphere ...
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Weathering



Weathering is the breaking down of rocks, soil and minerals as well as artificial materials through contact with the Earth's atmosphere, biota and waters. Weathering occurs in situ, roughly translated to: ""with no movement"" , and thus should not be confused with erosion, which involves the movement of rocks and minerals by agents such as water, ice, snow, wind, waves and gravity and then being transported and deposited in other locations.Two important classifications of weathering processes exist – physical and chemical weathering; each sometimes involves a biological component. Mechanical or physical weathering involves the breakdown of rocks and soils through direct contact with atmospheric conditions, such as heat, water, ice and pressure. The second classification, chemical weathering, involves the direct effect of atmospheric chemicals or biologically produced chemicals also known as biological weathering in the breakdown of rocks, soils and minerals. While physical weathering is accentuated in very cold or very dry environments, chemical reactions are most intense where the climate is wet and hot. However, both types of weathering occur together, and each tends to accelerate the other. For example, physical abrasion (rubbing together) decreases the size of particles and therefore increases their surface area, making them more susceptible to rapid chemical reactions. The various agents act in concert to convert primary minerals (feldspars and micas) to secondary minerals (clays and carbonates) and release plant nutrient elements in soluble forms.The materials left over after the rock breaks down combined with organic material creates soil. The mineral content of the soil is determined by the parent material, thus a soil derived from a single rock type can often be deficient in one or more minerals for good fertility, while a soil weathered from a mix of rock types (as in glacial, aeolian or alluvial sediments) often makes more fertile soil. In addition, many of Earth's landforms and landscapes are the result of weathering processes combined with erosion and re-deposition.
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